Viesza is a rather fit Neko, standing at five foot, seven inches in height and having a rather curvaceous body. She has short dark red hair that stops just short of her shoulders. She has emerald green almond shaped eyes, and milky cream colored skin. Her ears are the typical cat ears that most Nekovalkyrja have, they stand pointed up and have white fur coming out from the insides of the ears, with the fur on the back matching the dark red hair color that she sports.
She tends to be a rather happy sort, with a mischievous side. She is rather proud of her combat capability and strongly determined to prove her worth to the one she cares for. She gets jealous easily, and tends to feel insecure about herself in comparison to prettier girls such as Abigayl. Despite this however, she has proven that she can have the mental fortitude needed to become a pirate, and pilot for The Black Vipers.
Not much is known about Viesza outside of she was born in YE31 to the Star Army, and served her three mandatory years. She left the Star Army to explore the universe and eventually came into contact with the ISC Juniper's captain, as well as her sister Neko, Raven. She also once had a Yamatai-go name, however she changed it in favor of a more universally accepted name. She was caught along with the captain, and Raven on the ISC Juniper by the crew of The Black Vipers lead by Abigayl Dorkley. During this time she developed a strange fixation on Kiet, a member of The Black Vipers, and an Iroma. Due to this she struck a bargain with Abigayl and betrayed the Captain and Raven and joined up with The Black Vipers.